/Engine/Source/Editor/LevelEditor/Public/LevelEditor.h
Create a tab manager for the level editor based on the given tab (or clears the tab manager if OwnerTab is null)
virtual void SetLevelEditorTabManager ( const [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [SDockTab](API\Runtime\Slate\Widgets\Docking\SDockTab) > & OwnerTab )